The Battle of Compiègne was fought on 26 September 715 and was the first definite battle of the civil war which followed the death of Pepin of Heristal, Duke of the Franks, on 16 December 714. Dagobert III had appointed one Ragenfrid as mayor of the palace in opposition to Pepin's choice as his successor: his grandson Theudoald. Ragenfrid enjoined battle on Theudoald, then young, and defeated him, sending him fleeing back to his grandmother Plectrude in Cologne. As soon as Charles Martel gathered his supporters and trained them, he triumphed over all comers.